Mix cream cheese until fluffy.,Blend in peanut butter and powdered sugar, mix well.,Slowly add milk.,Fold in 2-4 ounces of the whipped topping.,Set aside.,Spread fudge onto bottom and sides of prepared crust.,______,Freeze a few hours until just set.,Spread remaining whipped topping over pie.,Sprinkle with chocolate chips.,Replace lid and freeze.,Thaw in fridge 2 or more hours, or counter 1 hour, before serving.